Is this for a 3rd Gen? Idea on model?

[Dave Baird]

Hi fellas. I am looking for a spare extractor for my 4046TSW. I found this unlabeled one. It's very close but I'm not sure about that little bump just behind the claw. It's not exactly the same as the pictures I've seen. Is this a newer/older version, or is it for another of the 3rd Gens?
Thank you!!!
Dave